Answer to Question #210277 in Algebra for Gracey

Question

Consider the following exam question and student solution Determine whether the solution is correctIf it is not correctwrite a note to the student explaining why it is wrong and give a correct solution. Exam Question: A candy store chocolate for pound The you want buy weighs 0.22 pound. How much will it cost to the nearest cent? (Neglect sales tax) Student Solution: 0.22/7.77 = 0.028 . It will cost 2.8 cents

Answer 1

Solution:

It is given that cost of 1 pound is $7.77.

We need to find the cost of 0.22 pound.

Then, cost of 0.22 pound = 0.22 x 7.77 = $1.7094 ~ $1 and 71 cents

The student did it incorrectly.

A note to student:

It is given that cost of 1 pound is $7.77.

We need to find the cost of 0.22 pound.

We need to multiply (not divide) them by the unitary method.

Then, cost of 0.22 pound = 0.22 x 7.77 = $1.7094 ~ $1 and 71 cents